1. A practical approach to the risk of cancer in inflammatory bowel disease;Butt, J.H.; Lennard-Jones, J.E.; Ritchie, J.K.;Med Clin North Am,1980
2. Cancer risk in extensive colitis;Kewenter, J.; Ahlman, H.; Hulten, L.;Ann Surg,1978
3. Long term prognosis in ulcerative colitis - based on results from a regional patient group from the county of Copenhagen;Hendriksen, C.; Kreiner, S.; Binder, V.;Gut,1985
4. Colorectal cancer in ulcerative colitis: a cohort study of primary referrals from three centres;Gyde, S.N.; Prior, P.; Allan, R.N.,1988
5. Weedon DD, Shorter RG, Ilstrup DM, et al. Crohn's disease and cancer. NEnglJMed 1973; 289: 1099-103.